Die-casting machine



Patented Feb, ll", 1931 STATES PATENT OFFICE FRANZ FERDINAND MANTEI, OF STUTTGART, GERMANY, .ASSIGrNOR T FRIEDRICH JOSEPH HAAS, OF STUTTGART, GERMANY DIE-CASTING MACHINE Application filed July 6, 1929, Serial No. 376,360, and in Germany February 12, 1926| My invention relates to die-casting machines and it is an object of my invention to provide a machine of the kind described, and to so perform the method, that the liquid metal is held out of contact with the die. To this end I insert a fluid under pressure between the discharge nozzle of the liquid metal and the die.

As compared with the existing methods in-' 1a volving immersion or ladling, not only the life of the die parts is much increased as they are insulated against radiation from the hot matter in the furnace, and warping of the die parts is consequently eliminated, but also the castings obtained are very exact. The outflow of the metal is not controlled by any mechanical parts and therefore wear is eliminated at this point, such mechanical parts being replaced by the controlling fluid.

In the drawings affixed to this specification and forming part thereof, a machine embodying my invention is illustrated diagrammatically by way of example.

In the drawings F g. 1 is a section on the axis of the machine,

Fig. :2 is a plan view of the machine with its die guide partly broken open.

Referring now to the drawings, G is a frame or casing, a is the reservoir for the molten metal, which is arranged within the frame or casing C, and is heated by any suitable means which will not be described, I) is a valve at the bottom of the reservoir, 0 is the rod of the valve 6, d is a float depending into the reservoir a,@ is a rod by which the float is suspended from the lever of the valve 7, g is a pipe to which fluid under pressure is suppl ed by any suitable means, not shown, under the control of the valve 7, h is a passage extending from the seat of the valve b to the chamber in the casingof the machine into which the iluid supply pipe 9 also opens, is a check valve here shown a hinged flap and adapted to control a hole in the wall 1' of the chamber which is opposite the opening of the passage h, Z is a cylindrical guide with which the hole is connected, and m and n are die parts adapted to reciprocate in the guide Z, The inner die part m is provided with.

packing rings m. Diametrally opposite slots Z, Fig. 2, are formed in the sides of the guide, and A, B are resilient hooks fitted to the part m as shown in Fig. 2, which are adapted to engage behind the end of the part it so as to connect the two parts. Instead of being resilient, the hooks may be provided with suitable springs, not shown, which force them out of the slots Z, when the part m is in its advanced position as shown in the drawings. When the part m is moved toward the chamber 11 the hooks A, B are forced inwardly by the ends of the slots.

0 is a pipe extending axially from the inner part m and connected with its cavity, 7) is a plunger fitted to slide in a bush q of the outer die part n, r is a central eccentric sheave operatively connected with th plunger p, s, s are eccentric sheaves at the sides of the central sheave and operatively connected with the sleeve 9, t is a shaft on which the eccentrics 7- and s, s are carried and which in turn is carried in the outer die part at, the sheaves being connected with the plunger and the bush by the usual rods and straps, and C is a pipe for evacuating the cavity of the die.

u is a driving 'crank shaft the crank of which is connected with the outer part 11 by a connectng rod 1) in which a spring to is inserted, w, as are links connecting'the shafts t and u, y is a pulley which is keyed on the crank shaft u, 1 is a pulley which is free to rotate on the shaft 1 but may be connected with the shaft by any suitable clutching means, not shown, and y" is a belt which is carried on the pulleys 1 and 7 and suitable intermediate pulleys m at the joints of links w, w. The belt 11 has been omitted in Fig. 2 in order to show the pulleys 3/, 1 and one of the intermediate pulleys as. 2 is apulley on the crank shaft u to which rotation is imparted by any suitable means, and j is a pedal fulcrumed in the frame of the machine by which the pulley z is operatively connected with the crank shaft u, automatic means, not shown, being provided for throwing out the connection between the shaft u and the-pulley a after the pulley has performed a complete revolution. Obviously other means than pulleys and belts may be provided throughout the machine, for instance sprockets and chains.

In operation fluid under pressure is admitted to the chamber a by the valve f and the valve 2) in the reservoir a is opened by means of its rod c. As the valve f is controlled by a float (Z and therefore adjusted in conformity with the liquid head of metal in the reservoir a, excessive pressure in the chamber 2' and return flow of fluid from the chamber 2' through the passage It are prevented.

Vhen it is desired to operate the die parts 127, n, the operator depresses the pedal j so that rotation is imparted to the crank shaft u by the continuously rotating pulley 2. As mentioned, the shaft is permitted to perform only a single revolution whereupon its connection with the pulley is interrupted by the afore-mentioned but not illustrated automatic means. During the first half revolution of the crank shaft u which rotates anticlockwise, the outer die part it with the shaft 25 carried therein is moved inwardly and abuts against the inner part m. The two parts now move in unison and are connected by the hooks A, B, which are forced inwardly by the ends of the slots 5. During the last part of the inward stroke of the die, the pipe 0 pushes open the valve In and advances as far as the end of the passage h in the chamber 2". In order to make up for any irregularities or wear, the spring w is inserted in the connecting rod 1), so that the parts will always be tightly connected, and a tight connection will be made between the pipe 0 and the passage h. By connecting the pipe and the passage the pressure fluid in the chamber 2' is cut off from the passage 7L and the molten metal is permitted to enter the pipe 0 and the cavity of the die which has been evacuated.

by the pipe C, under the head of the metal in the reservoir a. The shaft 25 now starts rotating under the action of its pulley or sprocket y which is connected with the shaft at this stage by any suitable means, not shown. The rotation of the shaft causes the plunger 7 and the sleeve 9 to penetrate into the molten metal. The sleeve 1 compresses the metal and the plunger 7; extrudes from the pipe 0 the residue of metal or advances the metal in the pipe so far as to permit its being extracted by a suitable implement. During the return half of the crank rotation the plunger and the sleeve 9 are retracted, the hooks A, B are released and the connection of the die parts is broken so that the die part m is left stationary while the part at is moving on to the end of its stroke with the shaft 1. It will be understood that the links, m, a: partake in the movement of the shaft 6 with respect to the shaft it without interfering with the belt y, g.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

In the claims aflixed to this specification no selection ofany particular modification of the invention is intended to the exclusion of other modifications thereof and the right to subsequently make claim to any modification not covered by these claims is expressly reserved.

I claim 1. A die-casting machine comprising a frame, a liquid reservoir on said frame, a guide on said frame, a die in said guide, means for reciprocating said die in said guide, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, said frame including a passage connecting said reservoir and said chamber, and means connected with said die for connecting said passage with the die across said chamber.

2. A die-casting machine comprising a frame, a liquid-metal reservoir on said frame, a. die, a chamber intermediate said die and said reservoir, means for supplying fluid under pressure to said chamber, said frame including a passage connecting said reservoir and said chamber, means connected with said die for connecting said passage with the die across said chamber, and means under the control of the liquid metal in said reservoir for regulating said supplying means in conformity with the liquid level in said reservoir.

3. A die-casting machine comprising a frame, a liquid reservoir on said frame, a guide on said frame, die parts adapted to reciprocate in said guide, means for reciprocating one of said parts, automatic means under the control of said guide for connecting said die parts into a single die, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, said frame including a passage connecting said reservoir and said chamber, and means connected with one of said die parts for connecting said passage with said die across said chamber.

4. A die-casting machine comprising a frame, a liquid reservoir on said frame, a guide on said frame, die parts adapted to reciprocate in said guide, means for reciprocat ing one of said parts, automatic means under the control of said guide for connecting said die parts into a single die, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, a partition separating said chamber from said guide, a check valve controlling an opening in said partition, said frame including a passage connecting said reservoir and said chamber, and a tubular extension on one of said die parts adapted to open said check valve, to pentrate into said chamber,

reciprocate in said guide, a shaft rotatably carried in one of said die parts a pair. of

coaxial plungers in said part, means on said shaft for reciprocating said plungers, means for reciprocating said part, means for imparting rotation to said shaft notwithstanding its reciprocation with said part, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, said frame including a passage connecting said'reservoir and said ,chamber, automatic means under the control of said guide for connecting said die parts into a single die, and means connected with that die part which is without said shaft for connecting said passage with said die across said chamber.

6. A die-casting machine comprising a frame, a liquid reservoir on said frame, a

guide on said frame, die parts adapted to reciprocate in said guide, a crank shaft in said frame, a rod connecting one of said parts with said crank shaft so as to impart rotation thereto, automatic means under the control of said guide for connecting said die parts into a single die, a shaft rotatably carried in one of said die parts, a pair of coaxial plungers in said part, means on said shaft for reciprocating said plungers, a flexible power-transmitting part operatively connecting said shaft in said die part with said crank shaft, links fulcrumed on said shafts and connected at their ends intermediate said shafts by pivots supporting parts adapted to guide said flexible part, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, said frame including a passage connecting said reservoir and said chamber, automatic means under the control of said guide for connecting said die parts into a single die, and means connected with that die part which is without said shaft for connecting said passage with said die across said chamber.

7. A die-casting machine comprising a frame, a liquid reservoir on said frame, a guide on said frame, die parts adapted to reciprocate in said guide, a crank shaft in said frame, a rod connecting one of said parts with said crank shaft so as to impart rotation thereto, a resilient part inserted in said connecting rod, automatic means under the control of said guide for connecting said die parts into a single die, a shaft rotatably carried in one of said die parts, a pair of co-axial plungers in said part, means on said shaft for reciprocating said plungers, a flexible powertransmitting part operatively connecting said shaft in said die part with said crank shaft, links fulcrumed on said shafts and connected at their ends intermediate said shafts by pivots supporting parts adapted to guide said flexible part, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, said frame including a passage connecting said reservoir and said chamber, automatic means under the control of said guide for connecting said die parts into a single die, and means connected with that die part which is without said shaft for connecting said passage with said die across said chamber.

8. A. die-casting machine comprising a frame, a liquid reservoir on said frame, a guide on said frame, die parts adapted to reciprocate in said guide, means for reciprocating one of said parts, automatic means under the control of said guide for connectin said die parts into a single die, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, said frame including a passage connecting. said reservoir and said chamber, a tubular extension on one of said die parts for connectin said passage with said die across said cham er, a plunger on the other one of said die parts which is adapted to penetrate into said extension, and means for reciprocating said plunger.

9. A die-casting machine comprising a frame, a liquid reservoir on said frame, a guide on said frame, die parts adapted to reciprocate in said guide, means for reciprocating one of said parts, automatic means under the control of said uide for connecting said die parts into a sing%e die, a chamber adapted to receive a charge of fluid under pressure arranged intermediate said guide and said reservoir, said frame including a passage connecting said reservoir and said chamber, a tubular extension on one of said die arts for connecting said passage with sai die across said chamber, a solid plunger on the other one of said die parts which is adapted to penetrate into said extension, a tubular plunger surrounding said solid plunger, and means for reciprocatin said plungers.

In testimony whereo I afiix my signature.

FRANZ FERDINAND MANTEI. 

